[aprssig] Is floating point telemetry allowed in APRS?

Charles Bland root at blandranch.net
Wed Mar 27 15:38:04 CDT 2013


Also look at the Base91 Telemetry spec (attached). This allows for larger
numbers and thus wider ranges.

Like the others (and I've just been through this writing APRS-TW) I only
know of telemetry being sent as integers and the equation values are what
adds the decimals...... per the specs.

Chuck

On Wed, Mar 27, 2013 at 1:09 PM, Steve Dimse <steve at dimse.com> wrote:

> The spec is not fluid that way. If it says telemetry should look like
>
> T#005,199,000,255,073,123,01101001
>
> sending
>
> T#005,199.1,000,255,073,123,01101001
>
> is not within the spec, and many parsers will reject the packet outright,
> others might truncate, still others might crash. The results are undefined
> and therefore should not be used. The whole point of the spec was to have
> data that everyone could understand in the same way.
>
> People that have non-standard needs are supposed to use the user-defined
> part of the spec which allows for any data one might need without causing
> problems in other parsers.
>
> Can you give an example of such a packet?
>
> Steve K4HG
>
>
>
> On Mar 27, 2013, at 4:01 PM, Charles Blackburn wrote:
>
> > that is a good question, although i would assume that you could just
> drop the fraction and be done with it.
> >
> > charlie
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > http://www.tapr.org/mailman/listinfo/aprssig
> >
>
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